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Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Lonely Planet - travel guide book publisher
Groups.io - Email and web based discussion group software, includes archiving, emails, wiki, polls, file...
Flamyngo - Create a city guide with help of your friends.
Gaggle Mail - Gaggle Mail is a simple and easy to use email list manager.
Sygic Maps - The world's first online maps designed for travelers